﻿/*******************************************************************************
 * Copyright © 2016 WaterCloud.Framework 版权所有
 * Author: WaterCloud
 * Description: WaterCloud快速开发平台
 * Website：
*********************************************************************************/

using System;
using System.DrawingCore;
using System.DrawingCore.Imaging;
using System.IO;

namespace WaterCloud.Code
{
	public class VerifyCodeHelper
	{
		public byte[] GetVerifyCode()
		{
			int codeW = 80;
			int codeH = 30;
			int fontSize = 16;
			string chkCode = string.Empty;
			//颜色列表，用于验证码、噪线、噪点
			Color[] color = { Color.Black, Color.Red, Color.Blue, Color.Green, Color.Orange, Color.Brown, Color.Brown, Color.DarkBlue };
			//字体列表，用于验证码
			string[] font = { "Times New Roman" };
			//验证码的字符集，去掉了一些容易混淆的字符
			char[] character = { '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'd', 'e', 'f', 'h', 'k', 'm', 'n', 'r', 'x', 'y', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'J', 'K', 'L', 'M', 'N', 'P', 'R', 'S', 'T', 'W', 'X', 'Y' };
			Random rnd = new Random();
			//生成验证码字符串
			for (int i = 0; i < 4; i++)
			{
				chkCode += character[rnd.Next(character.Length)];
			}
			//写入Session、验证码加密
			WebHelper.WriteSession("wcloud_session_verifycode", Md5.md5(chkCode.ToLower(), 16));
			//创建画布
			Bitmap bmp = new Bitmap(codeW, codeH);
			Graphics g = Graphics.FromImage(bmp);
			g.Clear(Color.White);
			//画噪线
			for (int i = 0; i < 3; i++)
			{
				int x1 = rnd.Next(codeW);
				int y1 = rnd.Next(codeH);
				int x2 = rnd.Next(codeW);
				int y2 = rnd.Next(codeH);
				Color clr = color[rnd.Next(color.Length)];
				g.DrawLine(new Pen(clr), x1, y1, x2, y2);
			}
			//画验证码字符串
			for (int i = 0; i < chkCode.Length; i++)
			{
				string fnt = font[rnd.Next(font.Length)];
				Font ft = new Font(fnt, fontSize);
				Color clr = color[rnd.Next(color.Length)];
				g.DrawString(chkCode[i].ToString(), ft, new SolidBrush(clr), (float)i * 18, (float)0);
			}
			//将验证码图片写入内存流，并将其以 "image/Png" 格式输出
			MemoryStream ms = new MemoryStream();
			try
			{
				bmp.Save(ms, ImageFormat.Png);
				return ms.ToArray();
			}
			catch (Exception)
			{
				return null;
			}
			finally
			{
				g.Dispose();
				bmp.Dispose();
			}
		}
	}

	public class GetJsVesion
	{
		public static string GetVcode()
		{
			TimeSpan ts = DateTime.UtcNow - new DateTime(1970, 1, 1, 0, 0, 0, 0);
			return Convert.ToInt64(ts.TotalSeconds).ToString();
		}
	}
}